BBAN is short for Basic Bank Account Number. It represents a country-specific bank account number. The BBAN is the last part of the IBAN when used for international funds transfers. Every country has it’s specific BBAN format and length depending on its own standards.
A BBAN is a country specific account number. Different countries have different lengths of account number (in the UK its eight digits, in the US its between 10-12). The BBAN forms the last part of an IBAN.